Expansive soil cutting structure and construction method thereof

Abstract

The invention discloses an expansive soil cutting structure and a construction method thereof. The structure comprises a three-span one-connection pile plate structure, a low-density foam light soil cushion layer, a pile soil zero-friction device and cutting longitudinal water seepage and drainage systems. Longitudinal water seepage and drainage systems are arranged on the two sides of a cutting;the influence of environmental hydrological conditions on expansive soil within the cutting width range is reduced; particularly, a layer of low-density foam light soil is paved at the bottom of the bearing platform plate, the bottom of the joist and the side surface area; the characteristic of low strength of the low-density foam light soil is utilized; the low-density foam light soil serves as abottom die in the pile plate construction period, the principle that crushing is prone to occurring under the action of expansive force of expansive soil in the line operation period is adopted, theupward expansion amount of the expansive soil is digested, and therefore the problem that due to the expansive soil expansion effect, a high-speed railway line upheaves, and line smoothness is deteriorated is solved.

Description

technical field [0001] The invention relates to the technical field of rock-soil roadbed deformation control, in particular to an expansive soil cutting structure and a construction method thereof. Background technique [0002] Expansive soil is distributed in many provinces in my country, and the area is relatively wide. In order to ensure the stability of the subgrade and the smoothness of the line in a long period of time, and to achieve the purpose of safe and comfortable driving, a series of engineering quality problems caused by expansive soil must be solved. [0003] The clay component of expansive soil is mainly composed of strongly hydrophilic clay minerals (such as montmorillonite and illite), which have large expansion properties and relatively high plastic limit and liquid limit. Therefore, expansive soil has the property of absorbing water and swelling, and it will absorb water and expand when it encounters water, and it will lose water and shrink when it loses...

AI Technical Summary

Problems solved by technology

But this kind of cavity will also bring the following three problems: 1. The cavity reserved under the cap plate is closed, and when the train passes by at high speed, it will form a "drum" effect, loading the track-pile slab Structural vibration and noise increase; in addition, energy waves are constantly reflected in closed cavities, and this emission amplifies the impact of energy waves on the pile-slab structure

2. Not all sections have expansive soil (rock), and the swelling amount of expansive soil (rock) distributed along the line is also different. If all cavities are reserved under the cap slab, it is a kind of controlled expansive soil ( rock) extreme measure of impact on the line, and will also aggravate the impact of the first problem

3. The height of the cavity reserved under the bearing plate is small, which will cause difficulties in the demoulding construction work of the joist and bearing plate after construction

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